在IMS环境下实作CSCF一致性测试平台

3GPP（3rd Generation Partnership Project）在Release5提出IP多媒体子系统（IP Multime-dia Subsystem,IMS）以提供IP多媒体服务.在建置IMS服务时,验证CSCF组件是否有达到标准所定的规范是第1道关卡.本论文采用电信测试标准TTCN-3（Testing and Test Control Notation-version3）,研发CSCF Conformance TestTool一致性测试平台（简称CSCF-T）,以及利用OpenI MS进行测试.     

基于TransCAD的"一路一线"公交布线方法仿真研究

“一路一线”是近年来提出的一种公交布线新思路,目前还没有在实际中得以应用。为了验证“一路一线”公交布线方法的可行性,以佛山南海中心城区桂城为研究对象,运用仿真软件TransCAD建立起公交仿真系统。在对仿真对象公交线网现状进行仿真校验的基础上,再采用“一路一线”的公交布线方法重新设计其公交线网．进行仿真。为了评价“一路一线”公交布线方法的仿真效果,从设施水平和服务水平两个方面设定评价指标,分别对现状公交线网和采用“一路一线”方法布设的公交线网仿真的结果进行了比较、评价。该项研究对验证“一路一线”公交布线方法的可行性进行了有益探索,为城市公共交通的改善尤其是新兴城市公交线网的设计提供借鉴。     

铁路应急通信网络组呼的组播路由算法分析

从建立GSM-R铁路应急通信网络的需要出发,在组播路由算法ODMRP的基础上通过改进,提出1种支持GSM-R铁路应急通信网络组呼的组播路由新算法(REGCA)及其算法流程。在该算法中加入了抑制听者发言、限制洪泛区域以及允许自动加入临时组播等控制策略。使用NS2仿真工具建立武广高铁应急通信系统自组网仿真模型,然后根据模型建立相应的仿真场景,对REGCA算法进行仿真分析。仿真结果表明,采用REGCA算法能够大大减轻网络负载、提高分组投递率、降低端到端传输时延和路由开销;采用REGCA算法在各种仿真场景中的分组投递率均达80%以上,端到端传输平均时延均在0.4s以下,能够满足GSM-R铁路应急通信环境下的组呼要求。     

A Tool for Coastal Setbacks Demarcation over Rough,Impermeable Shores: The Test Case of Kavala Coastline (Northern Greece)

Although setback zones and lines are considered as a powerful coastal zone management tool ensuring public access, protecting the coastal ecosystem and minimizing natural hazards over developments, the lack of a solid and objective Mediterranean methodological framework for coastal setbacks demarcation appears profound. Especially for countries like Greece, this deficiency leads to long legal disputes encouraging illegal construction on the coastline. In this article a methodology on coastal setbacks demarcation over rocky, impermeable shores is proposed, followed, and implemented along a Greek shoreline, serving as a pilot case study. The methodology is consistent with the requirements of the integrated coastal zone management (ICZM) Protocol and the Greek legislation (L. 2971/2001), aiming to determine the “highest winter waterline,” accounting for the tidal and storm surge effects, the sea-level rise due to climate change impact, the extreme offshore wind and wave analysis, and the maximum potential wave run-up. Such a tool may bridge the gap between legislative provisions and actual ICZM Protocol implementation improving regional coastal management and planning.